Method of making sodium-carbonate crystals.



Patented Aug. 2|, |900. J. KUNSTNER.

(Application Iled Apr. 23, 1900.)

/VVE/VTRI TTVEYS.

METHOD 0F MAKING SODIUM CARBONATE CRYSTALS.

(No Model.)

W/TNESSES- UNITED STATES ATE-NT- Friese.;

Josnrnnsrnnn, or onERsEpL'iTVLAUssEce, AUSTRIA-HUNGARY METHOD oFMAKlNG soDl'uM-CARBONATE CRYSTALS.

SPECIFICATIO forming part of Lettr'stentNo. 656,253, dated August21,1900.

i Application filed April Q3, 1900. 'Serial No. 13,955. (No specimens.)

To aZZ whom) it may concern? Be it known that I, JOSEF'KNSTNER, man-u-vfacturer, a subject of the Emperor of Austria- Hungary, residing atObersedlitz-Aussegg,`in the Empire of Austria-Hungary, have inventedcertain new and useful Improvements in the Manufacture ofCarbonate-of-Soda Crystals; and I do hereby declare the following to. bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it 'appertains to make and usethe same.

This invention relates to an improved process for the manufacture ofcaibonate-of-soda crystals, in particular of small crystals.

The process consists'n eifecting the solution in water ofthe carbonateof soda from which the crystals are to be produced, such solution beingthen concentrated by evaporation until a saturated carbonate-oI-souasolution 1s obtained. The temperature of this solution must be such thatit-will not then crystallize. This temperature may advantageously be 85centigrade. The solution is then converted into spray, whereupon thesprayed liquid is cooled, whereby the crystallization thereof iseffected. If thought desirable, theglwarm saturated carbonate-of-sodasolution can also this is not essentially necessary. A

The .cooling of the sprayed carbonate-fsoda solution can be effected bycausing a jet of compressed air to impinge upon a jet of the solutionissuing in the same direction. The cooling of the liquid particlescan,lhow ever, also be eiected by bringing intocontact with the :sprayedsolution a current of cold air passing in the contrary direction'as thefinely-divided solution'falls to the ground. Or both the said methodsmay be employed in combination -in such manner that a jet of 'besomewhat cooled before it is sprayed ,gbut

compressed airis first brought in contact with the jet of solution, soas to effect the spraying and cooling thereof, after which the fallingspray is brought in contact with another forced current of air passingin the contrary direction. i

I will describe the process with reference to the accompanying drawing,which shows ay vertical section of a con-struction of apparatus that maybe employed for the purpose.

The concentrated ca'rbonate-of-soda soini tion is led through a pipe bintoa recipient r,-

Which may advantageously be connected with thecompressed-air supply bythe pipe n, so as to act as an air vessel. From the recipient ,fr thesolution presses through the pipe 'm into the cooling apparatus c', inwhich the cooling-water enters at bottom through a pipe e and issues attop through a pipe f. The soluton,.on the other hand, 'enters the coolerat top through o and issues at 'bottom through g. In a second cooler c2the air entering through the pipe a at o. is cooled by a current ofcool-` ing liquid entering at e at bottom andl leaving the cooler at f.-The4 carbouate-of-soda solution passes through pipe g from the cooler cto the"ejector d, provided with a spraying-nozzle, which propelsthesolution in the form of spray into a closed tower loathe nozzle being atthe saine' time suppl-led with compressed cooled-alifrom the cooler elthrough the pipevh. Thel tower into which the mixture ofcarbonate-of-"soda solution and lair is thrown is with advantage made atleast about twelve meters high,with a base of about thirty square metersarea. A strong current of cold'air is preferably injected at bottom by afan Z, so that in rising upward it meets the falling spray andthenescapes through the openings at t'. As the liquid particles fall,they crystallize in consequence of the strong 4cooling action to whichthey are subjected by their contact with the cold upward current of air,and the resulting fine carbonateof-soda crystals are deposited on theiloor of the tower.

If the tower be made of sufficient height, it is'possible to dispensewith compressed air for spraying the solution, the cooling of the .spraybeing effected during its downward fall by the upward current of coldair from Z.

The above-described process has the advantageover the crystallizingprocesses now in use in that the crystallizing-works for producing thesame output will occupy much less space.

The working can lbe arranged to be carried on in acontinuous manner. Thelarge crystallizing-tanks,heretofore employed can be dis ensed with.

here are no mother-liquors, as the whole ofthe carbonate' of sodaemployed is made to crystallize. y Also by operating in the above- IOOdescribed manner small carbonate-of-soda crystals are obtained withoutthe admixture ci? foreign substances orwithont the large ,ex-v

penditure of power hitherto necessary. y Having now particularlydescribed and ascertained the nature of myinvention and the manner inwhich the same is to be performed, I declare that what I claim is 1.Process for the production of carbonateof-soda crystals, consisting inconverting a warm saturated solution of carbonate of soda intorsmallparticles by spraying and cooling such sprayed small particles,substantiallyas described.

2. Process for the production of carbonateof-soda crystals consisting inconverting a Warm saturated solution of carbonate of soda into smallparticles by the spraying action of a jet of compressed air propelled inthe same direction as lthe jet of liquid whereby the liquid particlesare at the same time cooled, substantially as described'.

vby spraying, and thensnbjecting the falling particlesto anupward-directed current of 'cold air, substantially as described.

4. Process for the production o f carbonateof-soda crystals consistingin converting a 'warm saturated solution of carbonate o f soda intosmall particles by spraying'by means of a jet of compressed air issuingin the same dircction as the jet of 1iquid, and then subjecting thefalling liquid particles to u. second npward current of cold air,substantially as described. i l

In witness whereof Ihave hereunto set my hand in presence of vtwowitnesses. i

JOSEF KNSTNER.

Witnesses:

FR. BRUZA, ADOLPH FISCHER.

